EP3152261B1 - Revêtements aqueux, doux au toucher, polymérisables par rayonnement - Google Patents

Revêtements aqueux, doux au toucher, polymérisables par rayonnement Download PDF

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Publication number
EP3152261B1
EP3152261B1 EP15729720.1A EP15729720A EP3152261B1 EP 3152261 B1 EP3152261 B1 EP 3152261B1 EP 15729720 A EP15729720 A EP 15729720A EP 3152261 B1 EP3152261 B1 EP 3152261B1
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EP
European Patent Office
Prior art keywords
radiation
composition
aqueous
ethylenic unsaturation
aqueous polyurethane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15729720.1A
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German (de)
English (en)
Other versions
EP3152261A1 (fr
EP3152261B8 (fr
Inventor
Garry A. GBUR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Swimc LLC
Original Assignee
Sherwin Williams Co
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Publication date
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Publication of EP3152261B1 publication Critical patent/EP3152261B1/fr
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Publication of EP3152261B8 publication Critical patent/EP3152261B8/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/10—Esters
    • C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
    • C08F222/106—Esters of polycondensation macromers
    • C08F222/1065—Esters of polycondensation macromers of alcohol terminated (poly)urethanes, e.g. urethane(meth)acrylates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00

Definitions

  • This invention relates to a 1K radiation polymerizable waterborne soft-feel coatings having excellent adhesion, solvent and mar resistance, wherein the soft-feel coatings comprise a combination of an aqueous polyurethane dispersion and an aqueous polyurethane polyol.
  • Plastic substrates are generally low cost, durable and light weight; however, plastic is susceptible to being damaged by sunlight and weathering, impacts, and exposure to chemicals, including common chemicals found in lotions and insect repellants.
  • coatings have been developed for application to plastic substrates that are intended to protect the substrate and provide aesthetic value. More recently, coatings have been surfacing that not only protect the plastic surface but also impart a soft, grippy or rubbery feel to the otherwise hard plastic. These coatings have been generally branded with the term "soft-touch” or "soft feel” coatings.
  • Soft-feeling paints and coatings provide desirable aesthetic and tactile characteristics for a variety of applications, particularly articles that are touched by consumers.
  • Consumer electronic products such as cell phones, calculators, computers, tablets, readers, key boards, sports equipment, automotive armrests, dashboards etc. are all representative items which can desirably be coated with soft-feeling coatings.
  • soft-feel refers to a particular tactual sensation (tactility) or haptic property on the part of the cured, painted surface. Since the haptic soft-feel properties are typically measured by human touch, they are somewhat subjective and are typically described using terms such as cold, dry, velvety, silky, warm or rubbery, demonstrating a range from “low” haptic properties, such as an automotive exterior coating which might be considered as having a “hard” and “cold” tactile sensation while softer feeling films would have a “silky”, “velvety” or rubbery” tactile sensation, As used herein, the term “soft-feel” means coatings which upon cure have a velvety, silky, warm or rubbery feel as opposed to conventional (non-soft-feel) coatings which will typically feel cold and hard to the touch,
  • Soft-feel coatings have been subject to increasingly demanding specifications as well. Particularly, soft-feel coatings are being challenged to have improved adhesion, solvent resistance and hardness for protection of plastic and other substrates. Adhesion loss of the coating to the plastic substrate can, in some instances, cause damage to the underlying plastic substrate.
  • One approach to resolving this has been a multi-coating system incorporating a primer for chemical resistance and a soft-feel top coat. However, this multi-coating approach is time consuming and costly.
  • First-generation soft-feel coatings were largely solventborne polyurethanes based on blends of polyols and isocyanates. Environmental regulations and consumer preferences have caused coatings suppliers to develop more environmentally friendly technologies. Therefore, new generations of soft-feel coatings have shifted toward 2K waterborne chemistries, primarily, but not exclusively, utilizing polyurethane dispersions (PUDs). More recently, 1K soft-feel coatings have been under research.
  • PIDs polyurethane dispersions
  • Aqueous 1K soft-feel coatings utilizing hydroxy functional PUD's with crosslinkers such as polyisocyanates are known, but often have poor adhesion to plastics and poor alcohol resistance, especially if a very low Tg polymer is used to enhance the soft-feel nature of the product. Additionally, since isocyanates react with water it is often necessary to utilize an excess of isocyanate. The isocyanate groups continue to react and this "aftercuring" can adversely affect the soft-feel. Melamines and ureas are also known as crosslinkers but they often require elevated curing temperatures that are not acceptable on some plastics. Further, in 1K systems, the high temperatures required for crosslinking adversely affect the soft surface of the soft-feel coating. Further still, when coating plastics, the crosslinking temperature is limited by the softening temperature of the polymer substrate
  • the soft-feel coatings of this invention is directed to a 1K. waterborne soft-feel coating having excellent adhesion, solvent and mar resistance.
  • the soft-feel coatings of this invention can be applied to many substrates such as wood, plastic, metal, or paper and may be applied atop a primed or previously painted layer.
  • the coatings of this invention are especially useful on plastic substrates such as high impact polystyrene, acrylonitirle butadiene styrene (ABS), polycarbonate, thermoplastic polyurethane, polyvinyl chloride, etc.
  • This invention relates to single component water reducible radiation polymerizable coatings which cure to a film having excellent adhesion, solvent and mar resistance while maintaining a favorable tactile "soft-feel”.
  • the coatings involve the combination of:
  • the coatings can be conveniently cured by exposure to actinic radiation having a wavelength less than about 4000 Angstroms, such as ultraviolet and electron beam radiation.
  • the term, “substantially free of”, means that element, other than to the extent it may be incidentally present in any raw material, is not intentionally present or intentionally added.
  • condition of high energy radiation polymerization means typical reaction conditions within the industry for the high energy cure of polymers and at temperatures not exceeding those normally involved in flashing off solvents.
  • the water reducible compositions of this invention provide stable coatings having excellent adhesion, favorable soft-feel properties and excellent hardness and solvent resistance and protection for plastic and other substrates.
  • the radiation polymerizable aqueous coating compositions of this invention comprise:
  • the present invention is directed to a method for improving the adhesion, solvent and mar resistance of a soft-feel coating composition that comprises the combination of:
  • the weight solids ratio of the aqueous polyurethane dispersion having radiation polymerizable ethylenic unsaturation and the aqueous polyurethane polyol can be varied widely to obtain the desired "soft-feel".
  • the aqueous polyurethane dispersion having radiation polymerizable ethylenic unsaturation will be present at a level of weight solids such that the weight percent solids of the unsaturated PUD will be at least about 16% of the total combined weight solids of the unsaturated PUD and the polyol PUD. For many applications, it will be present at a level up to about 50% and for many applications will be at a range of about 16 to about 35%.
  • the coatings of this invention provide sufficient hardness and chemical resistance based upon the high energy cure alone and the coatings will be free of external crosslinkers such as isocyanates, ureas, melamines etc. that would be reactive with hydroxyl groups or other active hydrogen groups.
  • Ethylenically unsaturated aqueous polyurethane dispersions are well known in the art and are widely commercially available.
  • the polyurethanes typically contain pendent unsaturation groups and will have water-dispersibility assisting groups such as anionic, cationic, or hydrophilic groups to provide water dispersibility.
  • an aqueous polyurethane dispersion can be obtained by the reaction of one or more isocyanates and one or more active hydrogen containing compounds such as alcohols, amines, polyols or polyamides.
  • the active hydrogen containing groups can also contain ionic groups - such as acid functionality, for example from hydroxy functional carboxylic acids such as dimethylolpropanoic acid, malic acid and the like.
  • Non-ionic groups such as polyethylene oxide groups can also be incorporated to provide water miscibility.
  • Representative commercially available unsaturated polyurethane dispersions include Ucecoat® 7200 form Cytec, Bayhydrol® UV XP 2689/1 from Bayer Material Science, and Neorad® R-1500,
  • hydroxy functional water reducible polyurethane dispersions are well known in the art.
  • polyurethane polyols of relatively low hydroxyl value generally less than about 25, and for some embodiments between 10 and 20.
  • the polyurethane polyol will have a Tg of at least about 30°C.
  • the Tg of the polyol will be less than about 60°C. and sometimes less than 50°C.
  • the Tg will be in a range between 35 and 45°C.
  • the hydroxy functional polyurethane dispersions can be prepared by any method known in the art.
  • One representative method is by the reaction of one or more isocyanates and a stoichiometric excess of one or more polyols.
  • Ionic groups - such as acid functionality for example can be incorporated by the use of from hydroxy functional carboxylic acids such as dimethylolpropanoic acid, malic acid and the like.
  • Non-ionic groups such as polyethylene oxide groups can also be incorporated to provide water miscibility.
  • the coatings of this invention can also incorporate other materials known in the art.
  • water miscible organic solvents typically less than 20%, and often less than 10% by weight of the coating composition, can be added.
  • these solvents should be low boiling alcohols, ethers or similar materials that will evaporate quickly from the film once it is applied to minimize flash off time.
  • Flow agents, light stabilizers, dispersants and pigments can also be added.
  • compositions of this invention could be added to the compositions of this invention, but for some embodiments, such as those where the monomers might chemically attack or haze the substrate, or when it is desired to minimize exposure to monomers they can be excluded.
  • the compositions are free of unsaturated monomers.
  • the coatings will also contain an effective catalytic amount, usually about 0.1 to about 8% by weight of the polymerizable compounds, of a free radical polymerization initiator, such as a photoinitiator, to facilitate cure of the coating after application.
  • a free radical polymerization initiator such as a photoinitiator
  • Typical photoinitiators include benzophenone. Michler's ketone, diethoxyacetophenone, 2-chlorothioxanthone, hydroxy-alkyl phenones, and other materials known in the art.
  • compositions of this invention can be conveniently applied by any conventional method, such as spray, curtain coating, etc. to a substrate, allowed a short flash time (possibly at temperatures ranging up to about 60°C) and then cured by exposure to high energy radiation.
  • High energy radiation typically has a wavelength less than about 4,000 Angstroms such as electron beam or ultraviolet light radiation.
  • the exposure need only be long enough to provide the desired amount of cure.
  • the time required for cure depends on the intensity of the incident radiation, but typically sufficient cure can be obtained in one minute or less.
  • Typical doses of ultraviolet radiation range from about 5 to about 150 feet/minute/lamp while useful doses of electron beam radiation range from about 0.5 to about 15 megarads.
  • any other free radical initiator e.g. visible light initiators such as taught in U.S. 3,650,699 or U.S. 4,071,424 or by subjecting the coatings to heat in the presence of a heat sensitive free radical initiator.
  • visible light initiators such as taught in U.S. 3,650,699 or U.S. 4,071,424
  • these methods may he useful, they are not preferred for most embodiments because the thermal initiators are undesirable for heat-sensitive substrates and are less energy efficient than curing by exposure to radiation, and the visible light initiators often require special handling to avoid premature polymerization.
  • part means parts by weight and percentages are percent by weight.
  • a model coating formula containing a hydroxy functional polyurethane dispersion was prepared by combining materials in the order shown below: Raw Material Parts by Weight hydroxy functional polyurethane dispersion 1 719.23 defoamer 2 0.84 water 50.09 sodium nitrate 1.17 dipropylene glycol methyl ether (DPM) 16.72 2-butoxyethoxyethanol 25.09 defoamer 1.67 surfactant 3 0.84 UV stabilizer 4 1.09 dimethylethanolamine 1.67 associative thickener 5 7.19 water 16.73 defoamer 0.84 1 Commercially supplied polyurethane dispersion having a Tg of 41°C, and an OH # of 18.
  • Solvent resistance was measured by 50 rubs with isopropyl alcohol. Hardness was measured as pencil hardness on the Q-Steel panels.
  • the Solid ratio is the weight percent solids of the ethylenically unsaturated PUD divided by the total weight solids of the hydroxy functional PUD and the ethylenically unsaturated PUD combined.
  • Example Parts Example1 Parts Pre-Mix Solvent Resistance Hardness Feel Solid ratio 2 100 5 severe burnish HB velvety 5.7% 3 100 10 severe burnish HB velvety 10.8% 4 100 15 severe burnish H velvety 15.4% 5 100 20 moderate burnish HB velvety 19.5% 6 100 25 moderate burnish HB silky 23.3% 7 100 30 moderate burnish H silky 26.7% 8 100 35 moderate burnish HB silky 29.8%

Claims (14)

  1. Composition de revêtement aqueuse polymérisable par rayonnement consistant essentiellement en :
    (i) une dispersion aqueuse d'un polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement et qui est essentiellement exempt de groupements capables de réagir avec une fonctionnalité hydroxyle dans des conditions de polymérisation par rayonnement ; et
    (ii) une dispersion aqueuse d'un polyuréthane-polyol qui est essentiellement exempt d'insaturations éthyléniques polymérisables et qui ne réagit pas avec la dispersion aqueuse du polyuréthane (i) dans des conditions de polymérisation par rayonnement ;
    (iii) un photo-initiateur ; et
    (iv) de l'eau ;
    la composition de revêtement étant essentiellement exempte d'agents réticulants externes capables de réagir avec un hydrogène actif.
  2. Composition de revêtement de la revendication 1, où la composition présente des propriétés haptiques de douceur au toucher après durcissement.
  3. Composition de la revendication 1, où le polyuréthane-polyol a une Tg d'au moins 30 °C environ.
  4. Composition de la revendication 1, où le polyuréthane-polyol a une Tg d'au moins 35 °C environ.
  5. Composition de la revendication 1, où le polyuréthane-polyol a une Tg d'au moins 60 °C environ.
  6. Composition de la revendication 1, où le polyuréthane-polyol a une Tg d'au moins 45 °C environ.
  7. Composition de la revendication 1, où le polyuréthane-polyol a un indice d'hydroxyle inférieur à 25.
  8. Composition de la revendication 1, où le polyuréthane-polyol a un indice d'hydroxyle entre 10 et 20.
  9. Composition de la revendication 1, où la composition est essentiellement exempte de monomères à insaturation éthylénique.
  10. Composition de la revendication 1, où la dispersion aqueuse du polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement est présente à un taux en poids de solides tel que le pourcentage en poids de solides de la dispersion aqueuse du polyuréthane insaturé représente au moins 16 % environ du poids total combiné des solides de la dispersion du polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement et de le polyuréthane-polyol aqueuse.
  11. Composition de la revendication 1, où la dispersion aqueuse du polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement est présente à un taux en poids de solides tel que le pourcentage en poids de solides de la dispersion aqueuse du polyuréthane insaturé sera inférieur à 50 % environ du poids total combiné des solides de la dispersion du polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement et de le polyuréthane-polyol aqueuse.
  12. Composition de la revendication 1, où la dispersion aqueuse du polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement est présente à un taux en poids de solides tel que le pourcentage en poids de solides de la dispersion aqueuse du polyuréthane insaturé représentera entre 16 % et 35 % environ du poids total combiné des solides de la dispersion du polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement et de le polyuréthane-polyol aqueuse.
  13. Procédé permettant d'améliorer la sensation au toucher d'un substrat, ledit procédé comprenant l'application, sur au moins une surface du substrat, d'une composition de revêtement aqueuse et la polymérisation du revêtement par traitement par une quantité efficace d'un rayonnement actinique ; le revêtement polymérisable par rayonnement comprenant :
    (i) une dispersion aqueuse d'un polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement et qui est essentiellement exempt de groupements capables de réagir avec une fonctionnalité hydroxyle dans des conditions de polymérisation par rayonnement ; et
    (ii) une dispersion aqueuse d'un polyuréthane-polyol qui est essentiellement exempt d'insaturations éthyléniques polymérisables et qui ne réagit pas avec la dispersion aqueuse du polyuréthane (i) dans des conditions de polymérisation par rayonnement ;
    (iii) un photo-initiateur ; et
    (iv) de l'eau ;
    la composition de revêtement étant exempte d'agents réticulants externes capables de réagir avec le polyuréthane-polyol.
  14. Composition de revêtement aqueuse polymérisable par rayonnement consistant essentiellement en :
    (i) une dispersion aqueuse d'un polyuréthane qui comprend une insaturation éthylénique polymérisable par rayonnement et qui est essentiellement exempt de groupements capables de réagir avec une fonctionnalité hydroxyle dans des conditions de polymérisation par rayonnement ; et
    (ii) une dispersion aqueuse d'un polyuréthane-polyol dont la Tg est entre 35 et 60 °C et l'indice d'hydroxyle inférieur à 25 environ, qui est essentiellement exempt d'insaturations éthyléniques polymérisables et qui ne réagit pas avec la dispersion aqueuse du polyuréthane (i) dans des conditions de polymérisation par rayonnement ;
    (iii) un photo-initiateur ; et
    (iv) de l'eau ;
    la composition de revêtement étant exempte d'agents réticulants externes capables de réagir avec le polyuréthane-polyol et le revêtement présentant une texture douce au toucher après polymérisation par traitement par une quantité efficace d'un rayonnement actinique.
EP15729720.1A 2014-06-05 2015-06-05 Revêtements aqueux, doux au toucher, polymérisables par rayonnement Active EP3152261B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201462008136P 2014-06-05 2014-06-05
PCT/US2015/034408 WO2015188063A1 (fr) 2014-06-05 2015-06-05 Revêtements aqueux, doux au toucher, polymérisables par rayonnement

Publications (3)

Publication Number Publication Date
EP3152261A1 EP3152261A1 (fr) 2017-04-12
EP3152261B1 true EP3152261B1 (fr) 2018-08-15
EP3152261B8 EP3152261B8 (fr) 2018-12-26

Family

ID=53404956

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Application Number Title Priority Date Filing Date
EP15729720.1A Active EP3152261B8 (fr) 2014-06-05 2015-06-05 Revêtements aqueux, doux au toucher, polymérisables par rayonnement

Country Status (5)

Country Link
US (1) US10822520B1 (fr)
EP (1) EP3152261B8 (fr)
CN (1) CN106536650A (fr)
ES (1) ES2691554T3 (fr)
WO (1) WO2015188063A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022235604A1 (fr) * 2021-05-07 2022-11-10 Swimc Llc Procédé de durcissement d'un revêtement à base d'eau

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB916238A (en) 1969-02-05 1963-01-23 Technicon Instr Apparatus for supplying sample liquids and reagents for analysis and other purposes
GB1408265A (en) 1971-10-18 1975-10-01 Ici Ltd Photopolymerisable composition
AT410096B (de) * 1999-10-15 2003-01-27 Solutia Austria Gmbh Wasserverdünnbare bindemittel für ''soft-feel''-lacke
DE19957604A1 (de) * 1999-11-30 2001-05-31 Bayer Ag Polyurethan-Emulsionen
DE10324306A1 (de) 2003-05-30 2004-12-16 Bayer Materialscience Ag Wässrige PUR-Dispersionen zur Herstellung von Beschichtungen mit Softfeel-Effekt
US7396875B2 (en) * 2003-06-20 2008-07-08 Bayer Materialscience Llc UV-curable waterborne polyurethane dispersions for soft touch coatings
US8313837B2 (en) * 2007-03-02 2012-11-20 Akzo Nobel Coatings International B.V. Water borne soft-feel coating composition
CN104884493B (zh) * 2012-12-25 2017-02-08 宇部兴产株式会社 水性聚氨酯树脂分散体及其用途
US9920206B2 (en) * 2013-03-14 2018-03-20 The Sherwin-Williams Company Soft-feel coatings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2015188063A1 (fr) 2015-12-10
EP3152261A1 (fr) 2017-04-12
CN106536650A (zh) 2017-03-22
EP3152261B8 (fr) 2018-12-26
ES2691554T3 (es) 2018-11-27
US10822520B1 (en) 2020-11-03

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